How do I attach a parachute to my rocket?
See the Recovery Guide
for many ideas how to make your rocket come back safely. Here
are step-by-step instructions
on how to build a parachute deployment mechanism.

How much water should I put in my rocket?
This will depend on your rocket, but generally 1/3
is close enough to optimum. If you want a more accurate answer
then here is a full article on how much
water to use.

How can I make my rocket fly higher?
Here are 30 tips you can try to
get your rocket to fly higher.

My rocket doesn't fly straight,
what's wrong?Here are some
suggestions on fixing common
problems with a rocket that doesn't fly straight.

How much pressure can a 2L bottle hold?
This will vary from bottle to bottle and you will need to do
pressure tests for each
particular bottle, but thin walled 2L bottles can hold around
120psi.